Current Version

Keywords

Online handwriting, offline handwriting, signature, verification

Description

Six Sample signatures from the SigComp2009 dataset. The top row are genuine signature, the bottom row are forgeries.

The collection contains simultaneously acquired online and offline samples. The online dataset is called "NFI-online" and was processed and segmented by Louis Vuurpijl. The offline dataset is called "NFI-offline" and was scanned by Vivian Blankers from the NFI. The offline signatures were automatically segmented and visually inspected by Louis Vuurpijl. Processing of the segmented signatures was performed by Katrin Franke. The collection contains:

Technical Details

All writers were employees of the NFI. Each writer was asked to write his own signature on a A4 sheet of paper. Writers wrote with an inking digitizer pen on a Wacom A4-oversized tablet sampled at 200Hz at 2540 dpi resolution. The sheet of paper containing multiple boxes was fixed to the tablet.

All writers wrote inside or sometimes across the boxes, which were visible through the (blank) A4 paper. For the forgeries, each writer was asked to write a certain number of skilled forgeries on a A4 sheet of paper, maintaining the same procedure as described above.

This layout enabled relatively straight-forward segmentation in both the offline and online domains.

Writers were instructed to (i) practice in forging authentic signatures as much as they found necessary. Forgers were requested to do a free hand simulation of the authentic signatures, using a black inking pen on an A4 paper sheet on top of the tablet (ii) write each signature in the corresponding boxes. During the forging process they were allowed to use a sheet with the authentic signature
as an example.

During all recordings, an experimenter was present, guiding the writers in the data acquisition process. The task of the experimenter was to collect writer details, fix each A4 sheet of paper properly, and start recording the online samples by pressing a button.